# Minimal Two-component Scalar Doublet Dark Matter with Radiative Neutrino Mass

## TL;DR

This paper introduces a minimal extension of the Standard Model with two inert scalar doublets and a right-handed neutrino, enabling two-component dark matter and radiative neutrino mass generation, expanding viable dark matter mass range.

## Contribution

It presents a novel two-component scalar doublet dark matter model with radiative neutrino masses, unifying dark matter and neutrino mass mechanisms in a minimal framework.

## Key findings

- Two-component dark matter model allows for a wider mass range.
- Inter-conversion between dark matter candidates enhances relic abundance.
- Model successfully explains neutrino masses radiatively.

## Abstract

We propose a minimal extension of the Standard Model to accommodate two-component dark matter (DM) and light neutrino mass. The symmetry of the Standard Model is enhanced by an unbroken $\mathbb{Z}_2 \times \mathbb{Z}'_2$ such that being odd under each $\mathbb{Z}_2$, there exists one right handed neutrino and one inert scalar doublet. Therefore, each of the $\mathbb{Z}_2$ sectors contribute to ($i$) light neutrino masses radiatively similar to the scotogenic models while ($ii$) the two neutral CP even scalars present in two additional inert doublets play the role of dark matters. Focusing on the intermediate range of inert scalar doublet DM scenario: $M_W \leq M_{\rm DM} \lesssim 500 \; {\rm GeV}$, where one scalar doublet DM can not satisfy correct relic, we show that this entire range becomes allowed within this two-component scalar doublet DM, thanks to the inter-conversion between the two DM candidates in presence of neutrino Yukawa couplings with dark sector.